package com.bbx.taxi.client.Util.ImageLoad;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.bbx.taxi.client.R;

import android.os.Handler;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;
import android.widget.ImageView;

public class ImageLoader {
    
    MemoryCache memoryCache=new MemoryCache();
    FileCache fileCache;
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
    ExecutorService executorService;
    Handler handler=new Handler();//handler to display images in UI thread
    
    public ImageLoader(Context context){
        fileCache=new FileCache(context);
        executorService=Executors.newFixedThreadPool(5);
    }
    // 当进入listview时默认的图片，可换成你自己的默认图片
     int stub_id=0;
    public void DisplayImage(String url, ImageView imageView,boolean isActivity)
    {
    	if(isActivity){
    		stub_id=R.drawable.loadimage;
    	}
        imageViews.put(imageView, url);
        // 先从内存缓存中查找
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null){
        	if(isActivity){
        		if(imageView!=null)
        		imageView.setBackgroundDrawable(new BitmapDrawable(bitmap));
        	}else{
        		if(imageView!=null)
        		imageView.setImageDrawable(new BitmapDrawable(bitmap));
        	}
        	
        }  
        else
        {
        	 // 若没有的话则开启新线程加载图片
            queuePhoto(url, imageView,isActivity);
            if(isActivity){
            	if(imageView!=null)
            	 imageView.setBackgroundResource(stub_id);
            }else{
            	if(imageView!=null)
            	 imageView.setImageResource(stub_id);
            }
           
        }
    }
        
    private void queuePhoto(String url, ImageView imageView,boolean isActivity)
    {
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        executorService.submit(new PhotosLoader(p,isActivity));
    }
    
    public Bitmap getBitmap(String url) 
    {
        File f=fileCache.getFile(url);
        /**
         * 先从文件缓存中查找是否有
         */
        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;
        /**
         *  最后从指定的url中下载图片
         */
        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            conn.disconnect();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Throwable ex){
           ex.printStackTrace();
           if(ex instanceof OutOfMemoryError)
               memoryCache.clear();
           return null;
        }
    }
    /**
     *  decode这个图片并且按比例缩放以减少内存消耗，虚拟机对每张图片的缓存大小也是有限制的
     */
    //decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            FileInputStream stream1=new FileInputStream(f);
            BitmapFactory.decodeStream(stream1,null,o);
            stream1.close();
            
            //Find the correct scale value. It should be the power of 2.
            int REQUIRED_SIZE=1000;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }
            
            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            FileInputStream stream2=new FileInputStream(f);
            Bitmap bitmap=BitmapFactory.decodeStream(stream2, null, o2);
            stream2.close();
            return bitmap;
        } catch (FileNotFoundException e) {
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    
    //Task for the queue
    private class PhotoToLoad
    {
        public String url;
        public ImageView imageView;
        public PhotoToLoad(String u, ImageView i){
            url=u; 
            imageView=i;
        }
    }
    
    class PhotosLoader implements Runnable {
        PhotoToLoad photoToLoad;
        boolean isActivity;
        PhotosLoader(PhotoToLoad photoToLoad,boolean isActivity){
            this.photoToLoad=photoToLoad;
            this.isActivity=isActivity;
        }
        
        @Override
        public void run() {
            try{
                if(imageViewReused(photoToLoad))
                    return;
                Bitmap bmp=getBitmap(photoToLoad.url);
                memoryCache.put(photoToLoad.url, bmp);
                if(imageViewReused(photoToLoad))
                    return;
                BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad,isActivity);
                handler.post(bd);
            }catch(Throwable th){
                th.printStackTrace();
            }
        }
    }
    /**
     * 防止图片错位
     * @param photoToLoad
     * @return
     */
    boolean imageViewReused(PhotoToLoad photoToLoad){
        String tag=imageViews.get(photoToLoad.imageView);
        if(tag==null || !tag.equals(photoToLoad.url))
            return true;
        return false;
    }
    /**
     *  用于在UI线程中更新界面
     *
     */
    //Used to display bitmap in the UI thread
    class BitmapDisplayer implements Runnable
    {
        Bitmap bitmap;
        PhotoToLoad photoToLoad;
        boolean isActivity;
        public BitmapDisplayer(Bitmap b, PhotoToLoad p,boolean isActivity){
        	bitmap=b;
        	photoToLoad=p;
        	this.isActivity=isActivity;
        	}
        public void run()
        {
            if(imageViewReused(photoToLoad))
                return;
            if(bitmap!=null){
            	if(isActivity){
            		if(photoToLoad.imageView!=null)
            		photoToLoad.imageView.setBackgroundDrawable(new BitmapDrawable(bitmap));
            	}else{
            		if(photoToLoad.imageView!=null)
            		photoToLoad.imageView.setImageDrawable(new BitmapDrawable(bitmap));
            	}
            }else{
            	if(isActivity){
            		if(photoToLoad.imageView!=null)
          		   photoToLoad.imageView.setBackgroundResource(stub_id);
          	   }else{
          		 if(photoToLoad.imageView!=null)
          		   photoToLoad.imageView.setImageResource(stub_id);
          	   }	  
            	
            }
               
        }
    }

    public void clearCache() {
        memoryCache.clear();
        fileCache.clear();
    }
    public enum CUT{
    	TOP,BOTTOM,LEFT,RIGHT
    }
    public void cut(final Context context,final ImageView imageview,final String url,final CUT type) {
    	new Thread(){
			@Override
			public void run() {
				 try{
		                Bitmap bmp=getBitmap(url);
		                memoryCache.put(url, bmp);
		                cut(context,imageview,bmp,type);
		            }catch(Throwable th){
		                th.printStackTrace();
		            }
			}
    		
    	}.start();
    	
    }
    /**剪切*/
 	public void cut(Context context,final ImageView imageview,Bitmap bitmap,CUT type) {
 		try{
 		int width=bitmap.getWidth();
 		int height=bitmap.getHeight();
 		switch(type){
 		case TOP:
 			bitmap=Bitmap.createBitmap(bitmap, 0, 0, width, height/2);
 			break;
 		case BOTTOM:
 			bitmap=Bitmap.createBitmap(bitmap, 0, height/2, width, height/2);
 			break;
 		case LEFT:
 			bitmap=Bitmap.createBitmap(bitmap, 0, 0, width/2, height);
 			break;
 		case RIGHT:
 			bitmap=Bitmap.createBitmap(bitmap, width/2, 0, width/2, height);
 			break;
 		}
		 final Bitmap mBitmap = bitmap;
 		((Activity)context).runOnUiThread(new Runnable() {
			
			@Override
			public void run() {
				imageview.setImageBitmap(mBitmap);
			}
		});
 		}catch(Exception e){}
 	}
}
